Method of watermarking paper.



W. J. F. MAIDHOF.

METHOD OF WATERMARKING PAPER.

APPLICATION FILED OUT. 6,.1909.

1,094,800, Patented Apr. 28, 1914.

2 SHEETS-SHEET 1.

W. J. P. MAIDHOF.

METHOD OF WATERMARKING PAPER.

APPLICATION FILED 0GT.6, 1909.

Patented Apr. 28, 1914.

2 SHEETS-SHEET 2.

Mam

WILLIAM J. F. MAIDHOF, 0F NEW'YORK, N. Y.

METHOD OF WATERMARKING PAPER.

Specification of Letters Patent.

Patented Apr. 28, 191%.

Application'iiled October 6, 1909. Serial No. 521,354.

To aZZ wIm m it may concern:

Be it known that I, WILLIAM J. F. Main- HOF, a citizen of the UnitedStates, and resident of the borough of Bronx, in the city and. StateofNew York, have invented a new and useful Method of Watermarking Paper,of which the following is a specification.

This invention relates to an improved method of water-markin paper, withthe object in view of providing a method by which paper may bewater-marked at any time, even after it has been manufactured, andwithout the necessity of any preparatory treatment; and in carrying outwhich method any ordinary printing or embossing form may be used.

It has heretofore been customary to watermark paper during the processof its manufacture, thus requiring a very large amount of paper to bestamped with a given mark in order to prevent the cost of water-markingrendering the price of the paper commercially prohibitive.

My method is especially adapted for marking small lots .of paper becauseit may be carried out in connection with finished paper.

A practical form of means for carrying out my method is represented inthe accompanying drawings, in which, Figure 1 represents a detailverticalsection through the cylinders of a rotary cylinder printing orembossing machine arranged to carry out my method; Fig. 2 represents adetail face view of the form cylinder; Fig. 3 represents a similar viewof the impression cylinder with the roughened sheet in place; Fig. 4represents a detail view of a piece of paper'after being Water-marked bythe apparatus represented in Figs. 1, 2 and 3; Fig. 5 represents adetail vertical section through a rotary flat bed printing or embossingmachine, with the sur face of the impression cylinder roughened, ar-

ranged to carry out my method by a modified means: Fig. 6 represents adetail face view of the form; Fig. 7 represents a detail face view ofthe impression cylinder, showing the roughened portion, and Fig. 8represents a detail view of a piece of paper watermarked by theapparatus represented in Figs. 5, 6, 7

Referring to the apparatus represented in Figs. 1 to 3 inclusive; theform cylinder is denoted by 1 and the impression cylinder by 2. Theformer is provided with the ordinary form or plate 3 secured thereon bythe clamps 4 and screws 5. The impression cyllnder is provided, at a.point registering wlth the form or plate 3 on the form cylinder,

with a roughened surface 6, which, in the present instance, consists ofa sheet of textile fabric, such as linen, secured in position on theimpression cylinder by clamps 7 and screws 8. The web or sheet to bemarked is indicated by 9.

' Referring now to the apparatus rcpresented in Figs. 5, 6, 7 the bed ofa rotary flat bed embossing or printing machine is lndicated by 10, andthe form 11 is held thereon by clamps 19.. The impression cylinder isrepresented by 13 and is provided with the usual grippers 14 forreceiving sheets to' be marked from the sheet feeding table 15.

The impression cylinder is further provided,

at point'ada ted to register with the.form on the bed, wit roughenedsurfaces 16, indicated in the present instance by a multitude of fineadjacent protuberances. The sheet to be marked is denoted by 17 In theapparatus set forth in Figs. 1, 2 and 3, as well as in that set forth inFigs. 5, 6, '7, the forms or plates 3 and 11 are provided on their faceswith a raised character 18, in the present instance, A. r

In operation, the sheets to be watermarked are subjected to the actionof the cylinders represented in ig. 1, or to the action of the cylinderand bed represented in Fig. 5. As a result, the character on the forms 3or 11 will be embossed on the sheets in exact simulation of water-marks.The roughened surface of the impression cylin- .der causes the characterto have a dull apparatively cheap and rapid and extremely desirableinthat it permits the commercial water-marking of small lots of paperafter the latter is manufactured.

It is to be understood that various changes may be made in the form,construction and arrangement of the means for carrying out my method;hence I do not wish to limit myself strictly to the mechanism hereinshown and described, but

' What I claim is:

1. The method of water-marking paper consisting in subjecting the paperto a direct contact with the form of a printing or emnoeeeoo Intestimony, that I claim the foregoing as It my invention, I have signedmy name in presence of tWo Witnesses, this fourth day of October 1909. I

WILLIAM J. F. MAIDIIUF.

Witnesses: K

I Gnome BARRY, HENRY 'IHnnnie.

